OneBrain Your AI Thinking Partner
SYS//ONEBRAIN.OS
NODE 0x4F2A · v3.2.21
NETWORK :: ONLINE
LAT 12ms · TX 873
UPTIME 00:00:00
REGION ASIA-SE-1
SCROLL ↓ TO_BROWSE
ONEBRAIN.OS :: CONSOLE_BOOTED // 31-MAY-2026

OneBrain: the AI thinking partner for Obsidian. UNIFIED INTELLIGENCE

OneBrain is the open-source AI thinking partner that lives inside your Obsidian vault.

You teach the agent, the agent extends you, and both get sharper every session.

$ brew install onebrain-ai/onebrain/onebrain
GET_STARTED_ ↗ BROWSE_30_COMMANDS
~/onebrain :: agent_loop_active
REC
MEMwarm
INBOX7
TASKS2 due
VAULT369 docs
// LIVE_FEED agent telemetry · sync 4s
ONEBRAIN // FEATURES

Built for
Synergetic Thinking.

OneBrain works your markdown as a shared workspace. Every feature exists to make you and the agent better at each other's job.

MEM_LAYER

Persistent Memory

Four tiers: working, episodic, semantic, knowledge. Across every session.

INTAKE_OS

Frictionless Capture

Braindump, capture, or bookmark, whichever matches your thought.

VEC_MATRIX

Semantic Search

QMD hybrid keyword + vector search. Recall any idea in seconds.

LINK_SYNC

Auto-Linking

Every new note gets wikilinks pulled from your existing knowledge graph.

SKILL_API

Skills System

30+ slash commands wrap deep workflows like /research, /distill, /search, and /schedule-add.

FS_STRUCT

PARA Native

Ready-made structure for Projects, Areas, Resources, and Knowledge folders.

ONEBRAIN // SYNERGY

Beyond a
Second Brain.

OneBrain co-evolves with you. Every preference you teach sharpens the agent, and every link it surfaces sharpens you.

01

HUMAN → AGENT

Every correction saves to memory/. The agent remembers it next session, not next week.

02

AGENT → HUMAN

Captures and links your raw thoughts, articles, and meeting notes automatically. You stay on what only you can do.

ONEBRAIN // STACK

Multi-Harness
Orchestration.

OneBrain orchestrates the harness you already use. Bring Claude Code, Gemini CLI, Codex, Qwen, or a raw API key, and switch any time. Your vault stays the constant; the harness is the variable.

PICK_BY familiarity: use the harness you already love
PICK_BY task: research with one, code with another
PICK_BY cost: local LLM for routine, premium API for the hard problems
RESULT context never breaks when you switch
OneBrain Harness OS, four stacked layers from top to bottom: OneBrain plugin and CLI (OS layer), Harness runtime, LLM intelligence source, and Obsidian Vault as the foundation.
ONEBRAIN // WORKFLOW

One Vault,
All Projects.

OneBrain turns Obsidian into your command center: research, planning, agent memory, and project state in one place, so you stop juggling tabs and tools.

  • » Read once, understand all: agent context lives in one place, never re-explained.
  • » Code in repos, orchestration in vault: the agent dispatches from here to wherever the work actually lives.
  • » Markdown replaces Slack, Linear, and Notion: version-controlled, AI-readable, yours forever.
Hub-and-spoke diagram. Obsidian vault sits at the center, with eight spokes radiating outward to CLI/repo, website, cloud infra, social media, office docs, project notes, research, and MCP server.
ONEBRAIN // SESSION

Every Session
Sharpens Both.

OneBrain runs as a tight 3-step loop. Each cycle feeds the next: the agent gets smarter and the vault gets richer, every round.

  1. 01

    CAPTURE

    Talk to the agent in natural language. It writes, classifies, and links your thoughts in real time.

    /braindump · /capture · /bookmark
  2. 02

    EVOLVE

    /research and /distill expand your knowledge. /learn deepens the agent. The loop tightens.

    /research · /distill · /learn
  3. 03

    WRAPUP

    /wrapup consolidates the session log. /recap promotes lessons to memory.

    /wrapup · /recap
Three-step session loop: 01 CAPTURE at top, 02 EVOLVE at bottom-right, 03 WRAPUP at bottom-left, with curved arrows flowing clockwise.
ONEBRAIN // COMMANDS

30+ Commands
That Think.

OneBrain ships 30+ slash commands and 5 background agents: vault-aware verbs that wrap real workflows. /research builds reports, /distill synthesizes weeks of notes, /schedule-add automates them on a cron.

See full list ↗
ONEBRAIN // CLOUD

OneBrain
Cloud.

OneBrain Cloud hosts your vault + agent runtime so the same memory, skills, and notes follow you from Mac to iPhone to wherever you write next.

01

FREE

// Always free & open source

Local vault · OSS skills · BYOK

[ AVAILABLE_NOW ]
02

PRO

Sync · mobile · hosted runtime

[ ~$10/MO · Q3 2026 ]
03

TEAM

Shared intelligence · team mesh

[ ~$25/MO · Q3 2026 ]
CLOUD WAITLIST :: OPEN
Built by @kengio

Early signups get priority access + founder pricing.

// limited slots before PRO opens